108 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxv. 



ished, basal portions of last three segments thinly whitish pruinose, 

 wings yellowish brown at base and along most of the yeins, third yein 

 bearing three bristles near the base, first posterior cell closed slightly 

 before the wingmargin, costal spine yery large; length, 8 mm. A 

 female specimen collected by Prof. J. M. Aldrich. 



Ilahliat. — Lewiston, Idaho. 



Tyjx'.—Cdii. No. 6200, U.8.N.M. 



PSEUDAPINOPS, new genus. 



Near Apinojys, but the palpi wanting. Head at yibrissa3 noticeabh^ 

 shorter than at base of antenna?, vibriss* on a leyel with anterior edge 

 of oral margin, facial ridges bristly nearly to the middle, cheeks almost 

 one-third as broad as the eye height, sides of face bare, at narrowest 

 part about one-tenth as wide as the median depression, antennte of 

 male nearly as long as the face, the third joint three times as long as 

 the second, in the female two-thirds as long as face, the third joint 

 scarcely longer than the second, arista bare, thickened on the basal 

 half, the penultimate joint slightly longer than broad, eyes bare, frontal 

 bristles descending below middle of second antennal joint, ocellar 

 bristles directed obliquely forward and outward, proboscis short and 

 robust, third yein with a few bristles near the base, other yeins bare, 

 first posterior cell open, ending just before the wingtip, bend of fourth 

 yein arcuate, without an appendage, hind crossyein midway between 

 the small and the bend. Type, the following species: 



PSEUDAPINOPS NIGRA, new species. 



Black, the antennte and proboscis dark brown; yertex one and one- 

 third times as wide as either eye, front not pruinose, face thinly whit- 

 ish pruinose; one pair of orbital bristles, uppermost pair of frontal 

 bristles directed outward; body not pruinose, three pairs of post- 

 sutural dorsocentral bristles, two or three sternopleurals. scutellum 

 bearing three long marginal pairs, no discal bristles; abdomen 

 depressed, ellipsoidal, the hairs yery short and depressed, the bristles 

 also short, none on dorsum of first two segments, a few marginal ones 

 on the third and seyeral on posterior half of the fourth; legs robust, 

 bristles few and short, claws and pulyilli short; wings nearly hyaline, 

 costal and marginal cells tinged with pale brown. cal3'pteres whitish; 

 length, 5 mm. Fifteen males and two females collected by Prof. J. M. 

 Aldrich. 



Ilahltat. — Moscow, Idaho. 



Type.— C2it. No. 0207, U.S.N.M. 



HYALOMYODES DORSALIS, new species. 



Male. — Black, the mouth parts dark brown; eyes almost contiguous, 

 the frontal yitta obliterated for a short distance: mesonotum and scu- 



